Wire annealing furnace is a kind of metal heat treatment process in which metal parts are slowly heated to a certain temperature in different types of annealing furnaces, kept for a period of time, and then cooled at an appropriate speed (usually natural cooling, sometimes controlled cooling).
The purpose of wire annealing furnace is to soften the materials or workpieces which have been cast, forged, welded or machined, reduce hardness, improve plasticity and toughness, homogenize chemical composition, remove residual stress, or obtain expected physical properties.
The common wire annealing furnace processes are as follows:
① Complete annealing.
② Spheroidizing annealing.
③ Isothermal annealing.
④ Recrystallization annealing.
⑤ Graphitization annealing.
⑥ Diffusion annealing.
⑦ Stress relief annealing.
The framework of wire annealing furnace is welded by various section steel, the outer frame is made of channel steel as main beam, the coaming plate is made of cold plate, the trolley is made of channel steel as main beam, and the bottom plate and front and rear end plates are made of medium plate.
Through the circulation of the fan, the temperature distribution in the wire annealing furnace chamber is uniform. The two chambers of the annealing furnace can operate independently, which improves the annealing efficiency. There are two fans in each furnace chamber, but there is no air filtering device, which is different from the actual situation. The temperature distribution in the continuous annealing furnace is uniform by fan circulation, and the microstructure of the film material is reconstructed by heat treatment to improve the stability and conversion efficiency. The internal stress of steel castings and weldments can be eliminated by heating the castings to about 950 ℃ and cooling them properly after holding for a certain time. For steel products which begin to form austenite below 100-200 ℃ after heating, the internal stress can be eliminated by cooling in air after heat preservation.